220kV high-voltage composite apparatus structure and deconstruction method

Abstract

The invention discloses a 220kV high-voltage combined electric appliance structure and a deconstruction method. An existing high-voltage composite apparatus is large in size and difficult to maintain. The combined electric appliance interval comprises a mutual inductor, an isolation grounding switch, a three-way bus, a wire inlet and outlet sleeve, a split bus, a double-fracture isolation switch and a movable circuit breaker. The main bus is formed by connecting buses at different intervals, the main bus is connected with the isolation grounding switch through the split bus, the isolation grounding switch is connected with the double-break isolation switch through the split bus, the double-break isolation switch is connected with the mobile circuit breaker through the split bus, the current transformer is connected with the three-way bus through the split bus, and the three-way bus is connected with the three-way bus through the split bus. The isolation grounding switch is connected with the wire inlet and outlet sleeve through a split bus. The disassembly range is reduced, other functional units do not need to be disassembled, traditional, low-efficiency and complex transfer modes such as rolling bars and cranes are replaced by the moving function, and the maintenance efficiency is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of combined electrical equipment, and in particular relates to a 220kV high-voltage combined electrical equipment structure and a deconstruction method. Background Art

[0002] High-voltage combined electrical appliances have made great progress in terms of product types, structural forms, insulating media, and comprehensive technical levels. They are currently in a relatively mature stage and can integrate various functional units according to the different needs of power construction to form an overall combined electrical appliance interval. In order to meet the demand for high-quality products, under the reality of incomplete design simulation methods, most equipment manufacturers consider a large design margin when designing the structure, which improves the reliability of the equipment while also resulting in a larger equipment size; the direct connection of the functional units of the combined electrical equipment promotes the high integration of the interval, but it will inevitably produce mutual influence during equipment maintenance. The above shortcomings are summarized as follows:

[0003] 1) Large size: The existing 220kV combined electrical appliances have large interval dimensions (interval width is generally more than 2m), large equipment size, large space occupation, large SF6 gas consumption, and inconvenient equipment transportation and installation; the interphase transmission components of the isolation and grounding switches are exposed. Although anti-corrosion technology is used, there is a risk of rust when operating for a long time in complex environments such as plateaus, alternating humidity and heat.

[0004] 2) Difficulty in maintenance: When a functional unit of the existing 220kV combined electrical appliances needs to be disassembled for maintenance or replacement, since there is no maintenance gap between the shell and the busbar, it is generally necessary to disassemble the combined electrical appliances from the interval terminal to the maintenance location. The disassembly range of the combined electrical appliances is relatively large, and local independent maintenance is difficult to achieve; the three-phase sub-box structure has many on-site disassembly surfaces and tedious phase-to-phase transmission debugging work, and the maintenance workload is relatively large. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the present invention provides a 220kV high-voltage combined electrical appliance structure and a deconstruction method to achieve efficient installation, reliable operation and improved maintenance efficiency.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A 220kV high-voltage combined electrical structure, specifically: a combined electrical compartment includes a mutual inductor, an isolating grounding switch, a three-way busbar, an inlet and outlet bushing, a split busbar, a double-break isolating switch, and a mobile circuit breaker;

[0008] The main busbar is a busbar connection between different intervals. The main busbar is connected to the isolating earthing switch through the split busbar, the isolating earthing switch is connected to the double-break isolating switch through the split busbar, the double-break isolating switch is connected to the mobile circuit breaker through the split busbar, the current transformer is connected to the three-way busbar through the split busbar, and the isolating earthing switch is connected to the incoming and outgoing line bushings through the split busbar.

[0009] Furthermore, the double-break disconnector integrates an disconnector and a grounding switch.

[0010] Furthermore, the double-break disconnector is provided with two disconnector breaks, which are arranged in a cast tank body with three phases in a common box and independent air chambers, and have a compact structure; the three-phase moving contacts are driven by a mechanism, which is connected to the external transmission system through insulating rods, and the two break contacts are synchronously opened and closed.

[0011] Furthermore, an auxiliary grounding device is provided between the two breaks of the double-break disconnector, and is manually operated and controlled to realize a protective grounding function under maintenance conditions.

[0012] Furthermore, the isolating and grounding switch adopts a three-station structure in a common box, integrating an isolating switch and a fast grounding switch.

[0013] Furthermore, the mobile circuit breaker comprises an expansion joint (1), a detachable unit (2), and a plug-in unit (5);

[0014] A heavy-load roller is arranged on the base frame of the mobile circuit breaker; the base frame of the circuit breaker is connected to the interval base frame via a fixing device (3); and a slide rail structure (4) matching the heavy-load roller is arranged on the interval base frame.

[0015] Furthermore, the split busbar adopts a connection structure in which the shell is segmented and the internal conductor is detachable.

[0016] A deconstruction method of a 220kV high-voltage combined electrical appliance structure, specifically:

[0017] When the circuit breaker module needs to be replaced, first disconnect it from other units, then remove the fastening bolts between the circuit breaker chassis and the spacing chassis; move the external power device to the bottom of the circuit breaker module, properly lift the loading platform to ensure reliable contact with the circuit breaker chassis, and then remove the circuit breaker module as a whole;

[0018] When the components in the interval need to be shut down for maintenance, the double-break disconnector can realize the maintenance of the bus without powering off. At the same time, it can be used as an interface for interval expansion to solve the problem of power outage of operating equipment during the expansion and withstand voltage test of the combination electrical equipment. When the interval is reserved for expansion and installation, the main bus does not need to be shut down, the double-break disconnector is opened, the auxiliary grounding device is closed, and the air chamber at the recovery interface is connected to complete the interval expansion installation and withstand voltage test.

[0019] Beneficial effects of the present invention:

[0020] 1) The present invention includes 4 traditional modules, namely mutual inductor, isolating earthing switch, three-way busbar, inlet and outlet bushing, and 4 new modules, namely split busbar, double-break isolating switch, and mobile circuit breaker. Each module is produced in the factory and can be quickly assembled, disassembled and replaced at the project site. Faulty modules can be returned to the factory for repair.

[0021] 2) Compared with the conventional structure circuit breaker maintenance, the present invention reduces the disassembly scope, does not need to disassemble other functional units (disconnectors, current transformers, etc.), and the mobile function replaces the traditional, inefficient and complicated transportation methods such as rollers and cranes, thereby significantly improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the movable circuit breaker of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the double-break disconnector of the present invention;

[0025] Figure 4 This is a schematic diagram of the split busbar structure of the present invention;

[0026] In the figure, 1-telescopic joint, 2-detachable unit, 3-fixing device, 4-slide rail structure, 5-plug-in unit. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with specific implementation modes.

[0028] The present invention has the characteristics of miniaturization, modularization and convenient maintenance; Figure 1 As shown, in the 220kV high-voltage combined electrical structure of the present invention, one combined electrical compartment includes a mutual inductor, an isolating grounding switch, a three-way busbar, an inlet and outlet bushing, a split busbar, a double-break isolating switch, and a mobile circuit breaker;

[0029] The main busbar is a busbar connection between different intervals. The main busbar is connected to the isolating earthing switch through the split busbar, the isolating earthing switch is connected to the double-break isolating switch through the split busbar, the double-break isolating switch is connected to the mobile circuit breaker through the split busbar, the current transformer is connected to the three-way busbar through the split busbar, and the isolating earthing switch is connected to the incoming and outgoing line bushings through the split busbar.

[0030] like Figure 3As shown in the figure, the double-break disconnector integrates the disconnector and the grounding switch, and is provided with two disconnector breaks, which are arranged in a three-phase common box and a casting tank with independent gas chambers, and have a compact structure; a mechanism drives the three-phase moving contact, which is connected to the external transmission system through an insulating rod, and the two break contacts are synchronously opened and closed. An auxiliary grounding device is set between the two breaks of the double-break disconnector, which is manually operated and controlled to realize the protective grounding function under maintenance conditions.

[0031] The isolating and grounding switch adopts a three-station structure in a common box, integrating an isolating switch and a quick grounding switch. The common box structure concentrates the three phases in the same housing, reducing the overall size of the functional unit and the overall amount of insulating gas used; reducing the gas chamber piping connection and flange docking surface reduces the risk of gas leakage; the isolating and grounding switch housing and conductor are made of cast aluminum alloy, and the interphase transmission components are installed inside the gas chamber and are not affected by external environmental factors, and mechanical failures caused by rust and jamming will not occur. The combined electrical appliance of the present invention adopts a horizontal circuit breaker. Except for the circuit breaker and current transformer functional units, other functional units all adopt a three-phase common box structure.

[0032] like Figure 2 As shown, the mobile circuit breaker includes a telescopic joint 1, a detachable unit 2, and a plug-in unit 5; a heavy-load roller is arranged on the chassis of the mobile circuit breaker; the chassis of the circuit breaker is connected to the interval chassis through a fixing device 3; and a slide rail structure 4 matching the heavy-load roller is arranged on the interval chassis.

[0033] like Figure 4 As shown, the split busbar adopts a connection structure with segmented shells and detachable internal conductors to achieve local rapid disassembly of the faulty unit, and the adjacent units do not need to recover gas and disassemble. In the conventional busbar connection structure, the two sides of the insulating partition are directly connected to the shell. When one side of the air chamber needs to be disassembled, the number of connecting bolts is halved. To ensure the safety of the equipment, the air chamber on the other side of the partition needs to be depressurized. Compared with the conventional structure, when one side of the air chamber needs to be disassembled, the insulating partition connection bolts do not need to be removed, so the air chamber on the other side does not need to be depressurized in theory. In addition, the new structure does not need to be disassembled from the interval terminal, which reduces the disassembly scope, greatly reduces the workload on site, and greatly improves the efficiency of maintenance and replacement.

[0034] The deconstruction method of the 220kV high-voltage combined electrical appliance structure of the present invention is specifically as follows:

[0035] When the circuit breaker module needs to be replaced, first disconnect it from other units, then remove the fastening bolts between the circuit breaker chassis and the spacing chassis; move the external power device to the bottom of the circuit breaker module, properly lift the loading platform to ensure reliable contact with the circuit breaker chassis, and then remove the circuit breaker module as a whole;

[0036] The chassis rollers play the role of assisting movement and preventing rollover. The circuit breaker can be moved independently after being disconnected from other units. Compared with the maintenance of conventional circuit breakers, the present invention reduces the disassembly scope and does not need to disassemble other functional units (disconnectors, current transformers, etc.). The mobile function replaces traditional, inefficient and complicated transportation methods such as rollers and cranes, which significantly improves the maintenance efficiency.

[0037] When the components in the interval (circuit breakers, current transformers, isolating and grounding switches, etc.) need to be shut down for maintenance, the double-break isolating switch can realize the maintenance of the bus without shutting down the power supply; at the same time, it can be used as an interface for interval expansion to solve the problem of power outage of operating equipment during the expansion and withstand voltage test of the combination electrical equipment interval; when the interval expansion installation is reserved, the main bus does not need to be shut down, the double-break isolating switch is opened, the auxiliary grounding device is closed, and the air chamber at the recovery interface is connected to complete the interval expansion installation and withstand voltage test.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A 220kV high voltage combined electrical structure, characterized in that: A combined electrical compartment includes mutual inductor, isolating earthing switch, three-way busbar, incoming and outgoing line bushings, split busbar, double-break isolating switch, and mobile circuit breaker; The main busbar is a busbar connection between different intervals. The main busbar is connected to the isolating earthing switch through the split busbar, the isolating earthing switch is connected to the double-break isolating switch through the split busbar, the double-break isolating switch is connected to the mobile circuit breaker through the split busbar, the current transformer is connected to the three-way busbar through the split busbar, and the isolating earthing switch is connected to the incoming and outgoing line bushings through the split busbar.

2. A 220kV high voltage combined electrical apparatus structure according to claim 1, characterized in that: The double-break disconnector integrates an disconnector and a grounding switch.

3. A 220kV high voltage combined electrical apparatus structure according to claim 2, characterized in that: The double-break disconnector is provided with two disconnector breaks, which are arranged in a casting tank body with three phases in a common box and independent air chambers, and have a compact structure. The three-phase moving contacts are driven by a mechanism, which is connected to an external transmission system through an insulating rod, and the two break contacts are synchronously opened and closed.

4. A 220kV high voltage combined electrical apparatus structure according to claim 3, characterized in that: An auxiliary grounding device is arranged between the two breaks of the double-break disconnector, and is manually operated and controlled to realize the protective grounding function under maintenance conditions.

5. A 220kV high voltage combined electrical apparatus structure according to claim 4, characterized in that: The isolating and grounding switch adopts a three-station structure in a common box and integrates an isolating switch and a fast grounding switch.

6. A 220kV high voltage combined electrical apparatus structure according to claim 5, characterized in that: The mobile circuit breaker comprises an expansion joint (1), a detachable unit (2), and a plug-in unit (5); A heavy-load roller is arranged on the base frame of the mobile circuit breaker; the base frame of the circuit breaker is connected to the interval base frame via a fixing device (3); and a slide rail structure (4) matching the heavy-load roller is arranged on the interval base frame.

7. A 220kV high voltage combined electrical apparatus structure according to claim 6, characterized in that: The split busbar adopts a connection structure in which the shell is segmented and the internal conductor is detachable.

8. A method for deconstructing a 220kV high-voltage combined electrical appliance structure, characterized in that: When the circuit breaker module needs to be replaced, first disconnect it from other units, then remove the fastening bolts between the circuit breaker chassis and the spacing chassis; move the external power device to the bottom of the circuit breaker module, properly lift the loading platform to ensure reliable contact with the circuit breaker chassis, and then remove the circuit breaker module as a whole; When the components in the interval need to be shut down for maintenance, the double-break disconnector can realize the maintenance of the bus without powering off. At the same time, it can be used as an interface for interval expansion to solve the problem of power outage of operating equipment during the expansion and withstand voltage test of the combination electrical equipment. When the interval is reserved for expansion and installation, the main bus does not need to be shut down, the double-break disconnector is opened, the auxiliary grounding device is closed, and the air chamber at the recovery interface is connected to complete the interval expansion installation and withstand voltage test.

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